%0 Journal Article %T Preface %A Istadi Istadi %J - %D 2015 %R 10.9767/bcrec.10.2.8770.iv-vi %X DOI: 10.9767/bcrec.10.2.8770.iv-v %U https://ejournal.undip.ac.id/index.php/bcrec/article/view/8770